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-rw-r--r--arch/x86/include/asm/cmpxchg_32.h67
-rw-r--r--arch/x86/include/asm/cmpxchg_64.h4
2 files changed, 21 insertions, 50 deletions
diff --git a/arch/x86/include/asm/cmpxchg_32.h b/arch/x86/include/asm/cmpxchg_32.h
index c1cf59d72f0..20955ea7bc1 100644
--- a/arch/x86/include/asm/cmpxchg_32.h
+++ b/arch/x86/include/asm/cmpxchg_32.h
@@ -53,60 +53,33 @@ struct __xchg_dummy {
__xchg((v), (ptr), sizeof(*ptr))
/*
- * The semantics of XCHGCMP8B are a bit strange, this is why
- * there is a loop and the loading of %%eax and %%edx has to
- * be inside. This inlines well in most cases, the cached
- * cost is around ~38 cycles. (in the future we might want
- * to do an SIMD/3DNOW!/MMX/FPU 64-bit store here, but that
- * might have an implicit FPU-save as a cost, so it's not
- * clear which path to go.)
+ * CMPXCHG8B only writes to the target if we had the previous
+ * value in registers, otherwise it acts as a read and gives us the
+ * "new previous" value. That is why there is a loop. Preloading
+ * EDX:EAX is a performance optimization: in the common case it means
+ * we need only one locked operation.
*
- * cmpxchg8b must be used with the lock prefix here to allow
- * the instruction to be executed atomically, see page 3-102
- * of the instruction set reference 24319102.pdf. We need
- * the reader side to see the coherent 64bit value.
+ * A SIMD/3DNOW!/MMX/FPU 64-bit store here would require at the very
+ * least an FPU save and/or %cr0.ts manipulation.
+ *
+ * cmpxchg8b must be used with the lock prefix here to allow the
+ * instruction to be executed atomically. We need to have the reader
+ * side to see the coherent 64bit value.
*/
-static inline void __set_64bit(unsigned long long *ptr,
- unsigned int low, unsigned int high)
+static inline void set_64bit(volatile u64 *ptr, u64 value)
{
+ u32 low = value;
+ u32 high = value >> 32;
+ u64 prev = *ptr;
+
asm volatile("\n1:\t"
- "movl (%1), %%eax\n\t"
- "movl 4(%1), %%edx\n\t"
- LOCK_PREFIX "cmpxchg8b (%1)\n\t"
+ LOCK_PREFIX "cmpxchg8b %0\n\t"
"jnz 1b"
- : "=m" (*ptr)
- : "D" (ptr),
- "b" (low),
- "c" (high)
- : "ax", "dx", "memory");
-}
-
-static inline void __set_64bit_constant(unsigned long long *ptr,
- unsigned long long value)
-{
- __set_64bit(ptr, (unsigned int)value, (unsigned int)(value >> 32));
-}
-
-#define ll_low(x) *(((unsigned int *)&(x)) + 0)
-#define ll_high(x) *(((unsigned int *)&(x)) + 1)
-
-static inline void __set_64bit_var(unsigned long long *ptr,
- unsigned long long value)
-{
- __set_64bit(ptr, ll_low(value), ll_high(value));
+ : "=m" (*ptr), "+A" (prev)
+ : "b" (low), "c" (high)
+ : "memory");
}
-#define set_64bit(ptr, value) \
- (__builtin_constant_p((value)) \
- ? __set_64bit_constant((ptr), (value)) \
- : __set_64bit_var((ptr), (value)))
-
-#define _set_64bit(ptr, value) \
- (__builtin_constant_p(value) \
- ? __set_64bit(ptr, (unsigned int)(value), \
- (unsigned int)((value) >> 32)) \
- : __set_64bit(ptr, ll_low((value)), ll_high((value))))
-
extern void __cmpxchg_wrong_size(void);
/*
diff --git a/arch/x86/include/asm/cmpxchg_64.h b/arch/x86/include/asm/cmpxchg_64.h
index b92f147339f..9596e7c6196 100644
--- a/arch/x86/include/asm/cmpxchg_64.h
+++ b/arch/x86/include/asm/cmpxchg_64.h
@@ -5,13 +5,11 @@
#define __xg(x) ((volatile long *)(x))
-static inline void set_64bit(volatile unsigned long *ptr, unsigned long val)
+static inline void set_64bit(volatile u64 *ptr, u64 val)
{
*ptr = val;
}
-#define _set_64bit set_64bit
-
extern void __xchg_wrong_size(void);
extern void __cmpxchg_wrong_size(void);